U.S. patent number 9,659,895 [Application Number 15/195,324] was granted by the patent office on 2017-05-23 for semi-conductor package structure.
This patent grant is currently assigned to Intel Corporation. The grantee listed for this patent is Intel Corporation. Invention is credited to Xinhua Wang.
United States Patent |
9,659,895 |
Wang |
May 23, 2017 |
Semi-conductor package structure
Abstract
Disclosed is a semiconductor package structure comprising a
body, a plurality of first-layer, second-layer, third-layer and
fourth-layer electrical contacts, wherein the first-layer, the
second-layer, the third-layer and the fourth-layer electrical
contacts are arranged sequentially from outside to inside on a
bottom surface of the body in a matrix manner. Adjacent first-layer
electrical contacts have two different spacings therein, and
adjacent third-layer electrical contacts have the two different
spacings therein.
Inventors: |
Wang; Xinhua (Hangzhou,
CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Intel Corporation |
Santa Clara |
CA |
US |
|
|
Assignee: |
Intel Corporation (Santa Clara,
CA)
|
Family
ID: |
54220725 |
Appl.
No.: |
15/195,324 |
Filed: |
June 28, 2016 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
|
US 20170005061 A1 |
Jan 5, 2017 |
|
Foreign Application Priority Data
|
|
|
|
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Jul 1, 2015 [CN] |
|
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2015 1 0378948 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01L
23/49838 (20130101); H01L 24/17 (20130101); H01L
24/02 (20130101); H01L 2224/17132 (20130101); H01L
23/49816 (20130101); H01L 2224/16225 (20130101); H01L
2224/02331 (20130101) |
Current International
Class: |
H01L
23/48 (20060101); H01L 23/00 (20060101); H01L
23/498 (20060101) |
Field of
Search: |
;257/775 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Chaudhari; Chandra
Attorney, Agent or Firm: Schiff Hardin LLP
Claims
The invention claimed is:
1. A semiconductor package structure, comprising: a body enclosing
a semiconductor chip and having a bottom surface; a plurality of
first-layer electrical contacts disposed on the bottom surface and
electrically connected to the semiconductor chip; a plurality of
second-layer electrical contacts disposed on the bottom surface and
electrically connected to the semiconductor chip; a plurality of
third-layer electrical contacts disposed on the bottom surface and
electrically connected to the semiconductor chip; and a plurality
of fourth-layer electrical contacts disposed on the bottom surface
and electrically connected to the semiconductor chip, the
first-layer, the second-layer, the third-layer and the fourth-layer
electrical contacts being arranged sequentially from outside to
inside on the bottom surface in a matrix manner, wherein adjacent
ones of the first-layer electrical contacts have two different
spacings therebetween, and adjacent ones of the third-layer
electrical contacts have the two different spacings therebetween,
wherein said two different spacing comprise a first spacing and a
second spacing greater than the first spacing.
2. The semiconductor package structure of claim 1, wherein the
second spacing is twice the first spacing.
3. The semiconductor package structure of claim 1, wherein the
first spacing is a minimum spacing between adjacent ones of the
first-layer electrical contacts.
4. The semiconductor package structure of claim 1, wherein the
first spacing is a minimum spacing between adjacent ones of the
third-layer electrical contacts.
5. The semiconductor package structure of claim 1, wherein the
first-layer electrical contacts comprise a first pair of electrical
contacts with the first spacing, a second pair of electrical
contacts with the first spacing and a third pair of electrical
contacts with the first spacing, the first pair of electrical
contacts and the second pair of electrical contacts having the
second spacing therebetween, the second pair of electrical contacts
and the third pair of electrical contacts having the second spacing
therebetween, and the second pair of electrical contacts being
located between the first pair of electrical contacts and the third
pair of electrical contacts.
6. The semiconductor package structure of claim 5, wherein the
third-layer electrical contacts comprise a fourth pair of
electrical contacts with the first spacing, a fifth pair of
electrical contacts with the first spacing and a sixth pair of
electrical contacts with the first spacing, the fourth pair of
electrical contacts and the fifth pair of electrical contacts
having the second spacing therebetween, the fifth pair of
electrical contacts and the sixth pair of electrical contacts
having the second spacing therebetween, and the fifth pair of
electrical contacts being located between the fourth pair of
electrical contacts and the sixth pair of electrical contacts.
7. The semiconductor package structure of claim 1, wherein the body
further has a package substrate with a first circuit layer and a
second circuit layer.
8. The semiconductor package structure of claim 7, wherein the
first circuit layer comprises a plurality of conductors and a
plurality of conductive portions, the conductive portions being
connected to the conductors and at least a portion of the
first-layer electrical contacts and the second-layer electrical
contacts respectively.
9. The semiconductor package structure of claim 7, wherein the
second circuit layer comprises a plurality of conductors and a
plurality of conductive portions, the conductive portions being
connected to the conductors and at least a portion of the
third-layer electrical contacts and the fourth-layer electrical
contacts respectively.
10. The semiconductor package structure of claim 1, wherein the
semiconductor package structure is a ball grid array package
structure.
Description
TECHNICAL FIELD
The present invention relates to a semiconductor package structure,
and in particular to a grid array package structure.
BACKGROUND
In the field of semiconductor package technology, common types of
semiconductor chip package comprise the ball grid array (BGA)
package, the chip scale package (CSP), the flip chip (FC) package
and the like. For example, a ball grid array package structure 200
as shown in FIGS. 1 and 2 mainly comprises a body 210 and solder
balls 220 arranged in array on a bottom surface 211 of the body
210, wherein the solder balls 220 can substitute for a conventional
metal lead frame to serve as electrical contacts, such that the
ball grid array package structure may have the merit of large area
and large quantity of transmitted signals. It needs to be
specifically noted that the body 210 has semiconductor chip
disposed therein, wherein the semiconductor chip may be
electrically connected to a underlying printed circuit board 100
through the solder balls 220 located on the bottom surface 211 of
the body 210.
However, with the increasing complexity of semiconductor circuits
and the increasing number of signal pins, there is generally
difficulty during circuit layout for package substrate.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, an embodiment of
the present invention provides a semiconductor package structure
comprising a body, a plurality of first-layer electrical contacts,
a plurality of second-layer electrical contacts, a plurality of
third-layer electrical contacts and a plurality of fourth-layer
electrical contacts. The body encloses a semiconductor chip and has
a bottom surface, and the first-layer, the second-layer, the
third-layer and the fourth-layer electrical contacts are
electrically connected to the semiconductor chip and are arranged
sequentially from outside to inside on the bottom surface in a
matrix manner. Wherein, adjacent first-layer electrical contacts
have two different spacings therebetween, and adjacent third-layer
electrical contacts also have the two different spacings
therebetween, wherein said two different spacings comprise a first
spacing and a second spacing greater than the first spacing.
In an embodiment of the present invention, the second spacing is
twice the first spacing.
In an embodiment of the present invention, the first spacing is a
minimum spacing between adjacent first-layer electrical
contacts.
In an embodiment of the present invention, the first spacing is a
minimum spacing between adjacent third-layer electrical
contacts.
In an embodiment of the present invention, the first-layer
electrical contacts comprise a first pair of electrical contacts
with the first spacing, a second pair of electrical contacts with
the first spacing and a third pair of electrical contacts with the
first spacing, the first pair of electrical contacts and the second
pair of electrical contacts having the second spacing therebetween,
the second pair of electrical contacts and the third pair of
electrical contacts having the second spacing therebetween, and the
second pair of electrical contacts being located between the first
pair of electrical contacts and the third pair of electrical
contacts.
In an embodiment of the present invention, the third-layer
electrical contacts comprise a fourth pair of electrical contacts
with the first spacing, a fifth pair of electrical contacts with
the first spacing and a sixth pair of electrical contacts with the
first spacing, the fourth pair of electrical contacts and the fifth
pair of electrical contacts having the second spacing therebetween,
the fifth pair of electrical contacts and the sixth pair of
electrical contacts having the second spacing therebetween, and the
fifth pair of electrical contacts being located between the fourth
pair of electrical contacts and the sixth pair of electrical
contacts.
In an embodiment of the present invention, the body further has a
package substrate with a first circuit layer and a second circuit
layer.
In an embodiment of the present invention, the first circuit layer
comprises a plurality of conductors and a plurality of conductive
portions, the conductive portions being connected to the conductors
and at least a portion of the first-layer electrical contacts and
second-layer electrical contacts respectively.
In an embodiment of the present invention, the second circuit layer
comprises a plurality of conductors and a plurality of conductive
portions, the conductive portions being connected to the conductors
and at least a portion of the third-layer electrical contacts and
fourth-layer electrical contacts respectively.
In a semiconductor package structure embodiment of the present
invention, the semiconductor package structure is a ball grid array
package structure.
To make the above-mentioned objects, features and advantages of the
present invention more comprehensible, a detailed description is
given below with preferred embodiments in conjunction with the
accompanied drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of a combination of an existing
semiconductor package structure and a circuit board;
FIG. 2 is a bottom view of the existing semiconductor package
structure of FIG. 1;
FIG. 3A is a schematic view of a semiconductor package structure of
an embodiment of the present invention;
FIG. 3B is a bottom view of the semiconductor package structure of
FIG. 3A;
FIG. 3C is a schematic view of adjacent first-layer electrical
contacts C1 having two different spacings D and 2D therebetween and
adjacent third-layer electrical contacts C3 having the two
different spacings D and 2D therebetween;
FIG. 4A is a schematic view of a first circuit layer in a package
substrate of a body; and
FIG. 4B is a schematic view of a second circuit layer in the
package substrate of a body.
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention are now described in
conjunction with the drawings.
The aforementioned and other technical contents, features and
performances related to the present invention will be clearly
presented in the following detailed description of a preferred
embodiment in conjunction with the drawings. The direction terms as
mentioned in the following embodiment, e.g., upper, lower, left,
right, front, rear, etc., are only directions with reference to the
accompanying drawings. Thus, the direction terms used are intended
to illustrate but not to limit the present invention.
Referring to FIG. 3A first, a semiconductor package structure 300
of an embodiment of the present invention is a ball grid array
package structure mainly comprising a body 310 and a plurality of
electrical contacts 320 disposed on the bottom surface 311 of the
body 310. The body 310 encloses a semiconductor chip (not shown),
wherein the semiconductor chip is electrically connected to the
electrical contacts 320, such that electronic signals are to be
transmitted to an external circuit board (not shown) through the
electrical contacts 320. The electrical contacts 320 are, for
example, solder balls, wherein the solder balls and corresponding
metal contacts on a circuit board may be electrically connected to
one another through welding in order to transfer electronic
signals.
As shown in FIG. 3B, the electrical contacts 320 disposed on the
bottom surface 311 of the body 310 are arranged in a matrix manner
and may be differentiated as, from outside to inside, first-layer
electrical contacts C1, second-layer electrical contacts C2,
third-layer electrical contacts C3 and fourth-layer electrical
contacts C4, according to different positions thereof. That is, the
first-layer, second-layer, third-layer and fourth-layer electrical
contacts C1-C4 are arranged sequentially from outside to inside on
the bottom surface 311 in a matrix manner.
Referring next to FIG. 3C, adjacent first-layer electrical contacts
C1 may have a first spacing D or a second spacing 2D therebetween,
wherein the second spacing 2D is greater than the first spacing D.
Likewise, adjacent third-layer electrical contacts C3 may also have
the first spacing D and the second spacing 2D therebetween. In this
embodiment, the first spacing D is the minimum spacing between the
adjacent first-layer electrical contacts C1 or between the adjacent
third-layer electrical contacts C3, and the second spacing 2D is
twice the first spacing D.
It can be seen from FIG. 3C that the outermost first-layer
electrical contacts C1 comprise a first pair of electrical contacts
P1, a second pair of electrical contacts P2 and a third pair of
electrical contacts P3, and these first, second and third pairs of
electrical contacts P1, P2, P3 respectively contain two electrical
contacts, said two electrical contacts forming a first spacing D1
therebetween. In particular, the first pair of electrical contacts
P1 and the second pair of electrical contacts P2 have the second
spacing 2D formed therebetween, and the second pair of electrical
contacts P2 and the third pair of electrical contacts P3 have the
second spacing 2D formed therebetween as well, with the second pair
of electrical contacts P2 being located between the first pair of
electrical contacts P1 and the third pair of electrical contacts
P3. That is, among the outermost first-layer electrical contacts
C1, the first spacing D and the second spacing 2D are arranged
alternately.
Still referring to FIG. 3C, the third-layer electrical contacts C3
comprise a fourth pair of electrical contacts P4, a fifth pair of
electrical contacts P5 and a sixth pair of electrical contacts P6
therein, and the fourth pair of electrical contacts P4, the fifth
pair of electrical contacts P5 and the sixth pair of electrical
contacts P6 respectively comprise two electrical contacts, with the
first spacing D being formed between the two electrical contacts.
In particular, the fourth pair of electrical contacts P4 and the
fifth pair of electrical contacts P5 have the second spacing 2D
formed therebetween, and the fifth pair of electrical contacts P5
and the sixth pair of electrical contacts P6 have the second
spacing 2D formed therebetween as well, with the fifth pair of
electrical contacts P5 being located between the fourth pair of
electrical contacts P4 and the sixth pair of electrical contacts
P6. That is, among the third-layer electrical contacts C3, the
first spacing D and the second spacing 2D are arranged alternately
as well.
With the aforementioned special configuration of electrical
contacts, the present invention makes the package substrate in the
body 310 easier to use during circuit layout. For example, when the
package substrate in the body 310 is a multi-layer circuit board,
conductors connecting the "outer" electrical contacts can be
arranged on a first circuit layer in the multi-layer circuit board,
while conductors connecting the "inter" electrical contacts can be
arranged on a second circuit layer in the multi-layer circuit board
so as to avoid difficulties during circuit layout caused by
over-crowded conductors.
Referring again to FIGS. 4A and 4B, the body 310 of this embodiment
comprises therein a package substrate which can be a multi-layer
circuit board and comprises at least a first circuit layer L1 and a
second circuit layer L2; it can be seen in FIG. 4A that a plurality
of conductors T1 and a plurality of conductive portions V1 are
disposed in the first circuit layer L1 of the package substrate,
and the conductive portions V1 may be vias in a direction
perpendicular to the bottom surface 311, wherein the interior of
said vias is filled with a conductive material and the positions of
said vias correspond to the electrical contacts 320 respectively.
The conductive portions V1 are not only connected to the
corresponding conductors T1 respectively, meanwhile each conductive
portion V1 is also connected to a portion of the first-layer
electrical contacts C1 and the second-layer electrical contacts C2
corresponding to the position of the conductive portion V1. It
needs to be specifically noted that as some adjacent first-layer
electrical contacts C1 have greater second spacing 2D formed
therebetween, conductors T1 extending from the inner conductive
portions V1 can easily pass through the gaps (the second spacing
2D) between the outer conductive portions V1 to reach the edge of
the package substrate (as shown in areas A1 to A4 in FIG. 4A, three
conductors T1 can be allowed to pass) and therefore the difficulty
in circuit layout can be significantly decreased.
For the same reason, it can be seen in FIG. 4B that a plurality of
conductors T2 and a plurality of conductive portions V2 are
disposed in the second circuit layer L2 in the package substrate,
and the conductive portions V2 may be vias in the direction
perpendicular to the bottom surface 311, wherein the interior of
said vias is filled with a conductive material to transmit
electronic signals, wherein the conductive portions V2 are not only
connected to corresponding conductors T2 respectively, meanwhile
each conductive portion V2 is also connected to a portion of the
third-layer electrical contacts C3 and the fourth-layer electrical
contacts C4 corresponding to the position of the conductive portion
V2. It needs to be specifically noted that as some adjacent
third-layer electrical contacts C3 have greater second spacing 2D
formed therebetween, conductors T2 extending from the inner
conductive portions V2 can easily pass through the gaps (the second
spacing 2D) between the outer conductive portions V2 to reach the
edge of the package substrate (as shown in areas B1 to B4 in FIG.
4B, three conductors T2 can be allowed to pass), therefore the
difficulty in circuit layout can be significantly decreased,
wherein circles denoted by dotted lines in FIG. 4B represent the
conductive portions V1 disposed in the first circuit layer L1 but
not extending to the second circuit layer L2.
To sum up, the present invention provides a semiconductor package
structure, wherein the semiconductor has first-layer, second-layer,
third-layer and fourth-layer electrical contacts that are disposed
sequentially from outside to inside on the bottom surface of the
body of the semiconductor package structure. By making adjacent
first-layer electrical contacts and adjacent third-layer electrical
contacts have two different spacings (a smaller spacing D and a
greater spacing 2D) therebetween, the present invention makes
circuit layout within package substrates easier, so as to increase
the overall performance and product yield of the semiconductor
package structure.
Although the present invention is disclosed in conjunction with the
above preferred embodiments, it is not intended to limit the
present invention. Any person skilled in the art can make some
modification and variation without departing from the spirit and
scope of the present invention, and accordingly, the scope of
protection of the present invention should be determined by those
defined the appended claims.
* * * * *